DOUBLE NEEDLE CHAIN STITCH STITCH CLASS 400 : MULTI THREAD CHAIN STITCH This stitch type is formed by inter-looping of two or more groups of thread. Stitch formation in the stitch type 401 MACHINE COMPONENTS Thread tension mechanism Thread tension Nut Tension post holder
This stitch type is formed by inter-looping of two or more groups of thread.
Stitch formation in the stitch type 401
Organ – UO113GS
Needles and needle sizes
Threading of the machine is very important
Chain stitch machine can have a speed up to 8000rpm
Angle for installing the looper and position of the looper holder bracket
There should be a clearance of 0~0.1mm between the point of the looper and the scarf of the needle
Position of the retainer loop
There should be a clearance of 0.5mm between the needle and the point of the retainer looper. Adjustment is made by loosening b as shown in the fig.
When the needle, moving from top to bottom of
Its stroke, enters the triangle of the looper thread, the retainer Looper should be at the extreme right end of its travel
The clearance between the retainer looper and the right side of looper should we 0.5 mm.
The clearance between the retainer looper and the top surface of the looper blade at 0.1mm
Position of the needle guard
When the needle is closest to needle guard, there should be clearance of 0~0.1mm between the right side of the needle and the guard.
When needle bar is at top of its stroke, the feed dog teeth should be 1~1.2mm above the top surface of the needle plate.
The stitch length can be adjusted from 2 to 5 mm.
Presser foot pressure should be as light
as possible yet, sufficient to feed the fabric.
Position of the presser foot
Accurate placement so that the needle can drop correctly
to the centre of the needle drop hole on the presser foot
Thread tension adjustment
It can be adjusted by adjusting the mount tension devices on the machine
( The tension should be as light as possible ).
Position of the needle thread eyelets
Secure needle thread eyelets should be at the top end of the slot.
( The needle thread eyelets can be raised to tighten the needle thread )